Nouns denoting natural phenomena

gentle breeze
wind moving 8-12 knots; 3 on the Beaufort scale
atmospheric phenomena accompanying the daily disappearance of the sun
abrupt electric discharge from cloud to cloud or from cloud to earth accompanied by the emission of light
covalent bond
a chemical bond that involves sharing a pair of electrons between atoms in a molecule
mass defect
the amount by which the mass of an atomic nucleus is less than the sum of the masses of its constituent particles
a localized and violently destructive windstorm occurring over land characterized by a funnel-shaped cloud extending toward the ground
head sea
a sea in which the waves are running directly against the course of the ship
line squall
a squall advancing along a front that forms a definite line
weather cold enough to cause freezing
a more or less vertical column of air whirling around itself as it moves over the surface of the Earth
a cloud of fine particles suspended in a gas
heat wave
a wave of unusually hot weather
water falling in drops from vapor condensed in the atmosphere
chemical energy
that part of the energy in a substance that can be released by a chemical reaction
chemical process in which one atom or ion or group changes places with another
brain wave
(neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph
turbulent water with swells of considerable size
black-body radiation
the electromagnetic radiation that would be radiated from an ideal black body; the distribution of energy in the radiated spectrum of a black body depends only on temperature and is determined by Planck's radiation law
placebo effect
any effect that seems to be a consequence of administering a placebo; the change is usually beneficial and is assumed result from the person's faith in the treatment or preconceptions about what the experimental drug was supposed to do; pharmacologists were the first to talk about placebo effects but now the idea has been generalized to many situations having nothing to do with drugs
van der Waal's forces
relatively weak attraction between neutral atoms and molecules arising from polarization induced in each particle by the presence of other particles
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